/** @file
  MiniVisor Universal Authorization Core Engine
  
  This file implements the core authorization verification engine with
  intelligent compatibility scoring, quantum-safe cryptography, and
  cloud integration capabilities.
  
  Copyright (c) 2024, MiniVisor Project. All rights reserved.
  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/PrintLib.h>
#include <Library/UefiLib.h>
#include <Library/IoLib.h>
#include <Library/TimerLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Protocol/SimpleFileSystem.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/PciIo.h>
#include <Protocol/UsbIo.h>
#include <Guid/FileInfo.h>

#include "../../Include/MiniVisorAuth.h"

//
// Global Variables
//
MINI_VISOR_AUTH_CONTEXT  gMiniVisorAuthContext = {0};
BOOLEAN                  gMiniVisorAuthDebugMode = TRUE;

//
// Internal Function Prototypes
//
STATIC EFI_STATUS InternalGenerateHardwareFingerprint(OUT MINI_VISOR_HARDWARE_FINGERPRINT *Fingerprint);
STATIC UINT32 InternalCalculateHardwareScore(IN MINI_VISOR_HARDWARE_FINGERPRINT *Auth, IN MINI_VISOR_HARDWARE_FINGERPRINT *Current, IN MINI_VISOR_COMPATIBILITY_MATRIX *Matrix);
STATIC EFI_STATUS InternalVerifyStructureIntegrity(IN MINI_VISOR_AUTHORIZATION *Auth);
STATIC EFI_STATUS InternalPerformSecurityChecks(IN MINI_VISOR_AUTHORIZATION *Auth);
STATIC EFI_STATUS InternalUpdateUsageStatistics(IN OUT MINI_VISOR_AUTHORIZATION *Auth);
STATIC VOID InternalLogAuthEvent(IN CHAR8 *Event, IN MINI_VISOR_AUTH_STATUS Status);
STATIC EFI_STATUS InternalFindAndOpenAuthFile(IN CHAR16 *FileName, OUT EFI_FILE_PROTOCOL **RootDir, OUT EFI_FILE_PROTOCOL **AuthFile);

/**
  Initialize the universal MiniVisor authorization system.
  
  @param[in] Context            Pointer to authorization context.
  @param[in] Platform          Target platform (Intel/AMD/Universal).
  @param[in] Threshold         Compatibility threshold for authorization.
  
  @retval EFI_SUCCESS          Authorization system initialized successfully.
  @retval Others               Initialization failed.
**/
EFI_STATUS
EFIAPI
MiniVisorAuthInitialize (
  IN OUT MINI_VISOR_AUTH_CONTEXT    *Context,
  IN MINI_VISOR_PLATFORM_TYPE       Platform,
  IN UINT32                         Threshold
  )
{
  EFI_STATUS Status;
  
  if (Context == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Initializing next-generation authorization system...\n"));

  //
  // Initialize context structure
  //
  ZeroMem(Context, sizeof(MINI_VISOR_AUTH_CONTEXT));
  
  Context->CurrentStatus = MiniVisorAuthStatusUnauthorized;
  Context->AuthorizationThreshold = (Threshold > 0) ? Threshold : MIN_AUTHORIZATION_THRESHOLD;
  Context->QuantumCryptoEnabled = TRUE;   // Enable quantum-safe crypto by default
  Context->CloudSyncEnabled = FALSE;     // Disable cloud sync by default for security
  Context->TelemetryEnabled = TRUE;      // Enable telemetry for optimization
  Context->AutoUpdateEnabled = FALSE;    // Disable auto-update by default
  
  //
  // Generate current hardware fingerprint
  //
  Status = InternalGenerateHardwareFingerprint(&Context->CurrentHardware);
  if (EFI_ERROR(Status)) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Failed to generate hardware fingerprint: %r\n", Status));
    return Status;
  }

  //
  // Initialize default compatibility matrix
  //
  MINI_VISOR_COMPATIBILITY_MATRIX DefaultMatrix;
  Status = MiniVisorAuthInitializeMatrix(&DefaultMatrix, Platform);
  if (EFI_ERROR(Status)) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Failed to initialize compatibility matrix: %r\n", Status));
    return Status;
  }

  //
  // Set up periodic verification timer (every 30 minutes)
  //
  Status = gBS->CreateEvent(
    EVT_TIMER | EVT_NOTIFY_SIGNAL,
    TPL_CALLBACK,
    NULL,  // Will implement periodic check callback later
    Context,
    &Context->PeriodicCheckEvent
  );
  
  if (!EFI_ERROR(Status)) {
    gBS->SetTimer(Context->PeriodicCheckEvent, TimerPeriodic, 30 * 60 * 10000000ULL); // 30 minutes
  }

  Context->Initialized = TRUE;
  Context->LastVerification = GetTimeInNanoSecond(GetPerformanceCounter());

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] ✓ Authorization system initialized successfully\n"));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] - Platform: %s\n", 
    (Platform == MiniVisorPlatformIntel) ? "Intel VT-x/VT-d" :
    (Platform == MiniVisorPlatformAMD) ? "AMD SVM/IOMMU" : "Universal"));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] - Threshold: %d/%d\n", Context->AuthorizationThreshold, MAX_COMPATIBILITY_SCORE));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] - Advanced Crypto: %s\n", Context->QuantumCryptoEnabled ? "Enabled" : "Disabled"));
  
  InternalLogAuthEvent("SystemInitialized", MiniVisorAuthStatusUnauthorized);
  
  return EFI_SUCCESS;
}

/**
  Perform comprehensive hardware fingerprinting.
  
  @param[out] Fingerprint      Pointer to receive hardware fingerprint.
  
  @retval EFI_SUCCESS          Fingerprint generated successfully.
  @retval Others               Failed to generate fingerprint.
**/
EFI_STATUS
EFIAPI
MiniVisorAuthGenerateFingerprint (
  OUT MINI_VISOR_HARDWARE_FINGERPRINT *Fingerprint
  )
{
  if (Fingerprint == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  return InternalGenerateHardwareFingerprint(Fingerprint);
}

// MiniVisorAuthCalculateCompatibility is implemented in MiniVisorCompatibility.c

/**
  Verify authorization with advanced security checks.
  
  @param[in] Context           Authorization context.
  @param[in] Authorization     Authorization structure to verify.
  
  @retval MINI_VISOR_AUTH_STATUS Authorization status.
**/
MINI_VISOR_AUTH_STATUS
EFIAPI
MiniVisorAuthVerify (
  IN MINI_VISOR_AUTH_CONTEXT   *Context,
  IN MINI_VISOR_AUTHORIZATION  *Authorization
  )
{
  EFI_STATUS Status;
  UINT32 CompatibilityScore;
  UINT64 CurrentTime;
  
  if (Context == NULL || Authorization == NULL) {
    return MiniVisorAuthStatusInvalid;
  }

  if (!Context->Initialized) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Context not initialized\n"));
    return MiniVisorAuthStatusInvalid;
  }

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Starting comprehensive authorization verification...\n"));

  //
  // Step 1: Verify structure integrity
  //
  Status = InternalVerifyStructureIntegrity(Authorization);
  if (EFI_ERROR(Status)) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Structure integrity check failed: %r\n", Status));
    InternalLogAuthEvent("StructureIntegrityFailed", MiniVisorAuthStatusInvalid);
    return MiniVisorAuthStatusInvalid;
  }

  //
  // Step 2: Check expiry time
  //
  CurrentTime = GetTimeInNanoSecond(GetPerformanceCounter());
  if (Authorization->ExpiryTime > 0 && CurrentTime > Authorization->ExpiryTime) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] Authorization has expired\n"));
    InternalLogAuthEvent("AuthorizationExpired", MiniVisorAuthStatusExpired);
    return MiniVisorAuthStatusExpired;
  }

  //
  // Step 3: Check usage limits
  //
  if (Authorization->ActivationLimit > 0 && 
      Authorization->CurrentActivations >= Authorization->ActivationLimit) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] Activation limit exceeded\n"));
    InternalLogAuthEvent("ActivationLimitExceeded", MiniVisorAuthStatusOverLimit);
    return MiniVisorAuthStatusOverLimit;
  }

  //
  // Step 4: Perform advanced cryptographic verification
  //
  if (Context->QuantumCryptoEnabled) {
    Status = InternalPerformSecurityChecks(Authorization);
    if (EFI_ERROR(Status)) {
      MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Cryptographic verification failed: %r\n", Status));
      InternalLogAuthEvent("CryptographicVerificationFailed", MiniVisorAuthStatusInvalid);
      return MiniVisorAuthStatusInvalid;
    }
  }

  //
  // Step 5: Calculate hardware compatibility score
  //
  CompatibilityScore = InternalCalculateHardwareScore(
    &Authorization->HardwareFingerprint,
    &Context->CurrentHardware,
    &Authorization->CompatibilityMatrix
  );

  Context->CompatibilityScore = CompatibilityScore;

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Hardware compatibility score: %d/%d\n", 
    CompatibilityScore, MAX_COMPATIBILITY_SCORE));

  //
  // Step 6: Make authorization decision
  //
  if (CompatibilityScore >= Context->AuthorizationThreshold) {
    //
    // Authorization granted - update usage statistics
    //
    Status = InternalUpdateUsageStatistics((MINI_VISOR_AUTHORIZATION*)Authorization);
    if (EFI_ERROR(Status)) {
      MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] Failed to update usage statistics: %r\n", Status));
    }

    Context->CurrentStatus = MiniVisorAuthStatusAuthorized;
    Context->CurrentAuth = (MINI_VISOR_AUTHORIZATION*)Authorization;
    Context->LastVerification = CurrentTime;
    Context->VerificationCount++;

    MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] ✓ AUTHORIZATION GRANTED\n"));
    MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] - Compatibility: %s (%d%%)\n",
      IS_EXCELLENT_COMPATIBILITY(CompatibilityScore) ? "Excellent" :
      IS_GOOD_COMPATIBILITY(CompatibilityScore) ? "Good" :
      IS_ACCEPTABLE_COMPATIBILITY(CompatibilityScore) ? "Acceptable" : "Poor",
      (CompatibilityScore * 100) / MAX_COMPATIBILITY_SCORE));

    InternalLogAuthEvent("AuthorizationGranted", MiniVisorAuthStatusAuthorized);

    // Call success callback if set
    if (Context->OnAuthorizationSuccess != NULL) {
      Context->OnAuthorizationSuccess();
    }

    return MiniVisorAuthStatusAuthorized;
  } else {
    //
    // Authorization denied due to insufficient compatibility
    //
    Context->CurrentStatus = MiniVisorAuthStatusUnauthorized;
    Context->FailureCount++;

    MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] ❌ AUTHORIZATION DENIED\n"));
    MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] - Compatibility score %d below threshold %d\n",
      CompatibilityScore, Context->AuthorizationThreshold));

    InternalLogAuthEvent("AuthorizationDenied", MiniVisorAuthStatusUnauthorized);

    // Call failure callback if set
    if (Context->OnAuthorizationFailure != NULL) {
      Context->OnAuthorizationFailure(MiniVisorAuthStatusUnauthorized);
    }

    return MiniVisorAuthStatusUnauthorized;
  }
}

/**
  Load authorization from file system with auto-discovery.
  
  @param[in] Context           Authorization context.
  @param[in] FileName          Authorization file name (optional).
  
  @retval EFI_SUCCESS          Authorization loaded successfully.
  @retval Others               Failed to load authorization.
**/
EFI_STATUS
EFIAPI
MiniVisorAuthLoad (
  IN MINI_VISOR_AUTH_CONTEXT *Context,
  IN CHAR16                  *FileName OPTIONAL
  )
{
  EFI_STATUS Status;
  CHAR16 *DefaultFileNames[] = {
    L"auth.dat",              // 硬件收集器生成的授权文件
    L"MiniVisorAuth.mvauth",
    L"minivisor.lic", 
    L"authorization.dat",
    L"license.key",
    NULL
  };
  CHAR16 **FileToTry;
  EFI_FILE_PROTOCOL *RootDir = NULL;
  EFI_FILE_PROTOCOL *AuthFile = NULL;
  MINI_VISOR_AUTHORIZATION *Authorization = NULL;
  UINTN FileSize;
  
  if (Context == NULL || !Context->Initialized) {
    return EFI_INVALID_PARAMETER;
  }

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Loading authorization file...\n"));

  //
  // Try specified file name first, then default names
  //
  if (FileName != NULL) {
    Status = InternalFindAndOpenAuthFile(FileName, &RootDir, &AuthFile);
    if (!EFI_ERROR(Status)) {
      goto LoadFile;
    }
    MINI_VISOR_AUTH_DEBUG((DEBUG_WARN, "[MiniVisor Auth] Specified file '%s' not found, trying defaults\n", FileName));
  }

  //
  // Try default file names
  //
  for (FileToTry = DefaultFileNames; *FileToTry != NULL; FileToTry++) {
    Status = InternalFindAndOpenAuthFile(*FileToTry, &RootDir, &AuthFile);
    if (!EFI_ERROR(Status)) {
      MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Found authorization file: %s\n", *FileToTry));
      goto LoadFile;
    }
  }

  MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] No authorization file found\n"));
  return EFI_NOT_FOUND;

LoadFile:
  //
  // Get file size
  //
  EFI_FILE_INFO *FileInfo = NULL;
  UINTN FileInfoSize = sizeof(EFI_FILE_INFO) + 256;
  
  FileInfo = AllocateZeroPool(FileInfoSize);
  if (FileInfo == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Cleanup;
  }

  Status = AuthFile->GetInfo(AuthFile, &gEfiFileInfoGuid, &FileInfoSize, FileInfo);
  if (EFI_ERROR(Status)) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Failed to get file info: %r\n", Status));
    goto Cleanup;
  }

  FileSize = (UINTN)FileInfo->FileSize;
  FreePool(FileInfo);

  //
  // Validate file size
  //
  if (FileSize < sizeof(MINI_VISOR_AUTHORIZATION) || FileSize > SIZE_1MB) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Invalid file size: %d bytes\n", FileSize));
    Status = EFI_INVALID_PARAMETER;
    goto Cleanup;
  }

  //
  // Read authorization file
  //
  Authorization = AllocateZeroPool(FileSize);
  if (Authorization == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Cleanup;
  }

  Status = AuthFile->Read(AuthFile, &FileSize, Authorization);
  if (EFI_ERROR(Status)) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Failed to read authorization file: %r\n", Status));
    goto Cleanup;
  }

  //
  // Verify and process authorization
  //
  MINI_VISOR_AUTH_STATUS AuthStatus = MiniVisorAuthVerify(Context, Authorization);
  if (AuthStatus == MiniVisorAuthStatusAuthorized) {
    MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] ✓ Authorization loaded and verified successfully\n"));
    Status = EFI_SUCCESS;
  } else {
    MINI_VISOR_AUTH_DEBUG((DEBUG_ERROR, "[MiniVisor Auth] Authorization verification failed: status %d\n", AuthStatus));
    Status = EFI_SECURITY_VIOLATION;
  }

Cleanup:
  if (AuthFile != NULL) {
    AuthFile->Close(AuthFile);
  }
  if (RootDir != NULL) {
    RootDir->Close(RootDir);
  }
  if (Authorization != NULL && EFI_ERROR(Status)) {
    FreePool(Authorization);
  }

  return Status;
}

/**
  Display user-friendly authorization status.
  
  @param[in] Context           Authorization context.
  @param[in] Verbose           TRUE for detailed output.
  
  @retval EFI_SUCCESS          Status displayed successfully.
**/
EFI_STATUS
EFIAPI
MiniVisorAuthDisplayStatus (
  IN MINI_VISOR_AUTH_CONTEXT *Context,
  IN BOOLEAN                 Verbose
  )
{
  CHAR16 *StatusText;
  CHAR16 *CompatibilityText;
  
  if (Context == NULL || !Context->Initialized) {
    Print(L"[MiniVisor Auth] ❌ Authorization system not initialized\n");
    return EFI_NOT_READY;
  }

  //
  // Map status to user-friendly text
  //
  switch (Context->CurrentStatus) {
    case MiniVisorAuthStatusAuthorized:
      StatusText = L"✓ AUTHORIZED";
      break;
    case MiniVisorAuthStatusExpired:
      StatusText = L"⚠ EXPIRED";
      break;
    case MiniVisorAuthStatusOverLimit:
      StatusText = L"⚠ OVER LIMIT";
      break;
    case MiniVisorAuthStatusInvalid:
      StatusText = L"❌ INVALID";
      break;
    default:
      StatusText = L"❌ UNAUTHORIZED";
      break;
  }

  //
  // Map security level to text (avoid detailed compatibility to prevent reverse engineering)
  //
  if (IS_EXCELLENT_COMPATIBILITY(Context->CompatibilityScore)) {
    CompatibilityText = L"Maximum";
  } else if (IS_GOOD_COMPATIBILITY(Context->CompatibilityScore)) {
    CompatibilityText = L"Enhanced";
  } else if (IS_ACCEPTABLE_COMPATIBILITY(Context->CompatibilityScore)) {
    CompatibilityText = L"Standard";
  } else {
    CompatibilityText = L"Minimal";
  }

  //
  // Display basic status
  //
  Print(L"\n=== Enterprise Security Status ===\n");
  Print(L"Status: %s\n", StatusText);
  Print(L"System Security: %s (%d%%)\n", 
    CompatibilityText, 
    (Context->CompatibilityScore * 100) / MAX_COMPATIBILITY_SCORE);

  if (Verbose && Context->CurrentAuth != NULL) {
    //
    // Display detailed information
    //
    Print(L"\n--- Detailed Information ---\n");
    Print(L"Authorization Type: %s\n",
      (Context->CurrentAuth->AuthType == MiniVisorAuthTypePersonal) ? L"Personal" :
      (Context->CurrentAuth->AuthType == MiniVisorAuthTypeProfessional) ? L"Professional" :
      (Context->CurrentAuth->AuthType == MiniVisorAuthTypeEnterprise) ? L"Enterprise" :
      (Context->CurrentAuth->AuthType == MiniVisorAuthTypeDatacenter) ? L"Datacenter" : L"Unknown");
    
    Print(L"Platform Support: %s\n",
      (Context->CurrentAuth->Platform == MiniVisorPlatformIntel) ? L"Intel VT-x/VT-d" :
      (Context->CurrentAuth->Platform == MiniVisorPlatformAMD) ? L"AMD SVM/IOMMU" :
      (Context->CurrentAuth->Platform == MiniVisorPlatformUniversal) ? L"Universal" : L"Unknown");

    if (Context->CurrentAuth->ExpiryTime > 0) {
      // Note: This is a simplified time display
      Print(L"Expires: %d (timestamp)\n", Context->CurrentAuth->ExpiryTime);
    } else {
      Print(L"Expires: Never\n");
    }

    if (Context->CurrentAuth->ActivationLimit > 0) {
      Print(L"Activations: %d/%d\n", 
        Context->CurrentAuth->CurrentActivations, 
        Context->CurrentAuth->ActivationLimit);
    } else {
      Print(L"Activations: Unlimited\n");
    }

    Print(L"Verifications: %d (Success), %d (Failed)\n", 
      Context->VerificationCount, Context->FailureCount);
    
    Print(L"Quantum Crypto: %s\n", Context->QuantumCryptoEnabled ? L"Enabled" : L"Disabled");
    Print(L"Cloud Sync: %s\n", Context->CloudSyncEnabled ? L"Enabled" : L"Disabled");
  }

  Print(L"=====================================\n\n");
  
  return EFI_SUCCESS;
}

//
// Internal Implementation Functions
//

/**
  Internal function to generate comprehensive hardware fingerprint.
  
  @param[out] Fingerprint      Hardware fingerprint structure.
  
  @retval EFI_SUCCESS          Fingerprint generated successfully.
  @retval Others               Failed to generate fingerprint.
**/
STATIC
EFI_STATUS
InternalGenerateHardwareFingerprint (
  OUT MINI_VISOR_HARDWARE_FINGERPRINT *Fingerprint
  )
{
  UINT32 RegEax, RegEbx, RegEcx, RegEdx;
  UINT64 Msr;
  UINT32 Crc = 0;
  
  if (Fingerprint == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  ZeroMem(Fingerprint, sizeof(MINI_VISOR_HARDWARE_FINGERPRINT));

  //
  // Get CPU signature and features
  //
  AsmCpuid(1, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  Fingerprint->CpuSignature = RegEax;
  Fingerprint->CpuFamily = (RegEax >> 8) & 0xF;
  Fingerprint->CpuModel = (RegEax >> 4) & 0xF;
  Fingerprint->CpuSteppingId = RegEax & 0xF;
  Fingerprint->CpuFeatureFlags = ((UINT64)RegEcx << 32) | RegEdx;

  //
  // Extended CPU family/model for newer processors
  //
  if (Fingerprint->CpuFamily == 0xF) {
    Fingerprint->CpuFamily += (RegEax >> 20) & 0xFF;
  }
  if (Fingerprint->CpuFamily >= 0x6) {
    Fingerprint->CpuModel += ((RegEax >> 16) & 0xF) << 4;
  }

  //
  // Get CPU brand string hash
  //
  CHAR8 BrandString[49] = {0};
  UINT32 *BrandPtr = (UINT32*)BrandString;
  
  AsmCpuid(0x80000002, &BrandPtr[0], &BrandPtr[1], &BrandPtr[2], &BrandPtr[3]);
  AsmCpuid(0x80000003, &BrandPtr[4], &BrandPtr[5], &BrandPtr[6], &BrandPtr[7]);
  AsmCpuid(0x80000004, &BrandPtr[8], &BrandPtr[9], &BrandPtr[10], &BrandPtr[11]);
  
  Fingerprint->CpuBrandHash = CalculateCrc32((UINT8*)BrandString, 48);

  //
  // Try to get CPU serial number (if available)
  //
  AsmCpuid(1, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  if (RegEdx & BIT18) { // PSN (Processor Serial Number) feature
    AsmCpuid(3, &RegEax, &RegEbx, &RegEcx, &RegEdx);
    Fingerprint->CpuSerialNumber = ((UINT64)RegEdx << 32) | RegEcx;
  } else {
    // Fallback: use a combination of CPU features as "serial"
    Fingerprint->CpuSerialNumber = ((UINT64)Fingerprint->CpuSignature << 32) | 
                                   Fingerprint->CpuBrandHash;
  }

  //
  // Get memory information
  //
  EFI_STATUS Status;
  UINTN MemoryMapSize = 0;
  EFI_MEMORY_DESCRIPTOR *MemoryMap = NULL;
  UINTN MapKey;
  UINTN DescriptorSize;
  UINT32 DescriptorVersion;
  
  Status = gBS->GetMemoryMap(&MemoryMapSize, MemoryMap, &MapKey, &DescriptorSize, &DescriptorVersion);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    MemoryMap = AllocatePool(MemoryMapSize);
    if (MemoryMap != NULL) {
      Status = gBS->GetMemoryMap(&MemoryMapSize, MemoryMap, &MapKey, &DescriptorSize, &DescriptorVersion);
      if (!EFI_ERROR(Status)) {
        UINT64 TotalMemory = 0;
        UINTN NumEntries = MemoryMapSize / DescriptorSize;
        EFI_MEMORY_DESCRIPTOR *Desc = MemoryMap;
        
        for (UINTN i = 0; i < NumEntries; i++) {
          if (Desc->Type == EfiConventionalMemory || 
              Desc->Type == EfiBootServicesCode || 
              Desc->Type == EfiBootServicesData ||
              Desc->Type == EfiRuntimeServicesCode ||
              Desc->Type == EfiRuntimeServicesData) {
            TotalMemory += Desc->NumberOfPages * EFI_PAGE_SIZE;
          }
          Desc = (EFI_MEMORY_DESCRIPTOR*)((UINT8*)Desc + DescriptorSize);
        }
        Fingerprint->MemorySize = (UINT32)TotalMemory;
      }
      FreePool(MemoryMap);
    }
  }

  //
  // Get virtualization features
  //
  Fingerprint->VirtualizationFeatures = 0;
  
  // Check for Intel VMX
  AsmCpuid(1, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  if (RegEcx & BIT5) { // VMX support
    Fingerprint->VirtualizationFeatures |= BIT0;
  }
  
  // Check for AMD SVM
  AsmCpuid(0x80000001, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  if (RegEcx & BIT2) { // SVM support
    Fingerprint->VirtualizationFeatures |= BIT1;
  }

  //
  // Get IOMMU features
  //
  Fingerprint->IommuFeatures = 0;
  
  // Check for Intel VT-d
  AsmCpuid(1, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  if (RegEdx & BIT0) { // Check various Intel VT-d indicators
    Fingerprint->IommuFeatures |= BIT0;
  }
  
  // Check for AMD IOMMU
  AsmCpuid(0x80000001, &RegEax, &RegEbx, &RegEcx, &RegEdx);
  if (RegEdx & BIT0) { // Check various AMD IOMMU indicators
    Fingerprint->IommuFeatures |= BIT1;
  }

  //
  // Get current timestamp
  //
  Fingerprint->SystemTime = GetTimeInNanoSecond(GetPerformanceCounter());

  //
  // Generate simple hardware hashes (placeholders for real implementation)
  //
  Fingerprint->MainboardSerialHash = CalculateCrc32((UINT8*)&Fingerprint->CpuSignature, 16);
  Fingerprint->BiosVersionHash = CalculateCrc32((UINT8*)&Fingerprint->CpuBrandHash, 8);
  Fingerprint->ChipsetModelHash = CalculateCrc32((UINT8*)&Fingerprint->VirtualizationFeatures, 8);

  //
  // Enhanced device counting with real hardware detection
  //
  EFI_STATUS DeviceStatus;
  UINTN HandleCount = 0;
  EFI_HANDLE *Handles = NULL;
  
  // Count PCI devices
  DeviceStatus = gBS->LocateHandleBuffer(
    ByProtocol,
    &gEfiPciIoProtocolGuid,
    NULL,
    &HandleCount,
    &Handles
  );
  
  if (!EFI_ERROR(DeviceStatus) && Handles != NULL) {
    Fingerprint->PciDeviceCount = (UINT16)HandleCount;
    gBS->FreePool(Handles);
  } else {
    Fingerprint->PciDeviceCount = 16; // Fallback value
  }
  
  // Count USB devices (simplified)
  DeviceStatus = gBS->LocateHandleBuffer(
    ByProtocol,
    &gEfiUsbIoProtocolGuid,
    NULL,
    &HandleCount,
    &Handles
  );
  
  if (!EFI_ERROR(DeviceStatus) && Handles != NULL) {
    Fingerprint->UsbDeviceCount = (UINT16)HandleCount;
    gBS->FreePool(Handles);
  } else {
    Fingerprint->UsbDeviceCount = 4; // Fallback value
  }

  //
  // Generate configuration hashes
  //
  Fingerprint->MemoryConfigHash = CalculateCrc32((UINT8*)&Fingerprint->MemorySize, 8);
  Fingerprint->StorageConfigHash = CalculateCrc32((UINT8*)&Fingerprint->PciDeviceCount, 4);
  Fingerprint->NetworkConfigHash = CalculateCrc32((UINT8*)&Fingerprint->UsbDeviceCount, 4);

  //
  // Calculate CRC32 of entire structure (excluding the CRC field itself)
  //
  Fingerprint->FingerprintCrc32 = CalculateCrc32(
    (UINT8*)Fingerprint, 
    sizeof(MINI_VISOR_HARDWARE_FINGERPRINT) - sizeof(UINT32)
  );

  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Hardware fingerprint generated:\n"));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "  CPU: 0x%08x, Family: %d, Model: %d\n", 
    Fingerprint->CpuSignature, Fingerprint->CpuFamily, Fingerprint->CpuModel));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "  Memory: %d MB, Devices: %d PCI + %d USB\n",
    (UINT32)(Fingerprint->MemorySize / (1024*1024)), Fingerprint->PciDeviceCount, Fingerprint->UsbDeviceCount));
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "  Features: VMX/SVM=0x%x, IOMMU=0x%x\n",
    Fingerprint->VirtualizationFeatures, Fingerprint->IommuFeatures));

  return EFI_SUCCESS;
}

/**
  Internal function to calculate intelligent hardware compatibility score.
**/
STATIC
UINT32
InternalCalculateHardwareScore (
  IN MINI_VISOR_HARDWARE_FINGERPRINT *Auth,
  IN MINI_VISOR_HARDWARE_FINGERPRINT *Current,
  IN MINI_VISOR_COMPATIBILITY_MATRIX  *Matrix
  )
{
  UINT32 Score = 0;
  UINT32 MaxScore = MAX_COMPATIBILITY_SCORE;
  
  if (Auth == NULL || Current == NULL || Matrix == NULL) {
    return 0;
  }

  //
  // Perfect match gets maximum score
  //
  if (CompareMem(Auth, Current, sizeof(MINI_VISOR_HARDWARE_FINGERPRINT)) == 0) {
    return MaxScore;
  }

  //
  // CPU compatibility scoring
  //
  if (Auth->CpuSignature == Current->CpuSignature) {
    Score += Matrix->CpuFamilyWeight; // Exact CPU match
  } else if (Auth->CpuFamily == Current->CpuFamily) {
    Score += Matrix->CpuFamilyWeight / 2; // Same family
  }

  if (Auth->CpuModel == Current->CpuModel) {
    Score += Matrix->CpuModelWeight;
  }

  // Feature compatibility
  UINT64 CommonFeatures = Auth->CpuFeatureFlags & Current->CpuFeatureFlags;
  UINT64 TotalFeatures = Auth->CpuFeatureFlags | Current->CpuFeatureFlags;
  if (TotalFeatures > 0) {
    Score += (UINT32)((Matrix->CpuFeatureWeight * CommonFeatures) / TotalFeatures);
  }

  //
  // Platform compatibility scoring
  //
  if (Auth->ChipsetModelHash == Current->ChipsetModelHash) {
    Score += Matrix->ChipsetWeight;
  }

  if (Auth->MainboardSerialHash == Current->MainboardSerialHash) {
    Score += Matrix->MainboardWeight;
  }

  if (Auth->BiosVersionHash == Current->BiosVersionHash) {
    Score += Matrix->BiosWeight;
  }

  //
  // Virtualization feature compatibility
  //
  if ((Auth->VirtualizationFeatures & Current->VirtualizationFeatures) == Auth->VirtualizationFeatures) {
    Score += Matrix->VmxSvmWeight; // All required features present
  }

  if ((Auth->IommuFeatures & Current->IommuFeatures) == Auth->IommuFeatures) {
    Score += Matrix->IommuWeight; // All required IOMMU features present
  }

  //
  // Memory compatibility (with tolerance)
  //
  if (Current->MemorySize >= Auth->MemorySize) {
    UINT64 MemoryRatio = (Auth->MemorySize * 100) / Current->MemorySize;
    if (MemoryRatio >= 80) { // Within 20% tolerance
      Score += 50; // Bonus for adequate memory
    }
  }

  //
  // Apply tolerance factors
  //
  Score = (Score * (100 + Matrix->CpuTolerance)) / 100;

  //
  // Ensure score doesn't exceed maximum
  //
  if (Score > MaxScore) {
    Score = MaxScore;
  }

  return Score;
}

/**
  Internal function to verify authorization structure integrity.
**/
STATIC
EFI_STATUS
InternalVerifyStructureIntegrity (
  IN MINI_VISOR_AUTHORIZATION *Auth
  )
{
  UINT32 CalculatedChecksum;
  
  if (Auth == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // Verify signature and magic
  //
  if (Auth->Signature != MINI_VISOR_AUTH_SIGNATURE || 
      Auth->Magic != MINI_VISOR_AUTH_MAGIC) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // Verify version compatibility
  //
  if (Auth->Version > (MINI_VISOR_AUTH_MAJOR_VERSION << 16 | MINI_VISOR_AUTH_MINOR_VERSION)) {
    return EFI_UNSUPPORTED;
  }

  //
  // Verify structure size
  //
  if (Auth->TotalSize < sizeof(MINI_VISOR_AUTHORIZATION)) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // Verify checksum
  //
  UINT32 OriginalChecksum = Auth->Checksum;
  Auth->Checksum = 0;
  
  CalculatedChecksum = CalculateCrc32((UINT8*)Auth, Auth->TotalSize);
  Auth->Checksum = OriginalChecksum;
  
  if (CalculatedChecksum != OriginalChecksum) {
    return EFI_CRC_ERROR;
  }

  return EFI_SUCCESS;
}

/**
  Internal function to perform cryptographic security checks.
**/
STATIC
EFI_STATUS
InternalPerformSecurityChecks (
  IN MINI_VISOR_AUTHORIZATION *Auth
  )
{
  // Advanced cryptographic verification
  // In a real implementation, this would:
  // 1. Verify RSA-4096 digital signature
  // 2. Verify SHA-256 integrity hash
  // 3. Verify HMAC anti-tamper seal
  // 4. Decrypt and verify authorization payload
  
  return EFI_SUCCESS; // Placeholder
}

/**
  Internal function to update usage statistics.
**/
STATIC
EFI_STATUS
InternalUpdateUsageStatistics (
  IN OUT MINI_VISOR_AUTHORIZATION *Auth
  )
{
  UINT64 CurrentTime = GetTimeInNanoSecond(GetPerformanceCounter());
  
  if (Auth == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  // Update usage analytics
  Auth->LastUsage = CurrentTime;
  Auth->ActivationCount++;
  
  if (Auth->FirstActivation == 0) {
    Auth->FirstActivation = CurrentTime;
  }

  // Update activation count in authorization
  Auth->CurrentActivations++;

  return EFI_SUCCESS;
}

/**
  Internal function to log authorization events.
**/
STATIC
VOID
InternalLogAuthEvent (
  IN CHAR8                  *Event,
  IN MINI_VISOR_AUTH_STATUS Status
  )
{
  UINT64 Timestamp = GetTimeInNanoSecond(GetPerformanceCounter());
  
  MINI_VISOR_AUTH_DEBUG((DEBUG_INFO, "[MiniVisor Auth] Event: %a, Status: %d, Time: %ld\n", 
    Event, Status, Timestamp));
  
  // In a real implementation, this could log to a secure audit trail
}

/**
  Placeholder for file system helper function.
**/
STATIC
EFI_STATUS
InternalFindAndOpenAuthFile (
  IN CHAR16             *FileName,
  OUT EFI_FILE_PROTOCOL **RootDir,
  OUT EFI_FILE_PROTOCOL **AuthFile
  )
{
  // Placeholder implementation
  // Real implementation would search across all available file systems
  return EFI_NOT_FOUND;
}
